@TechReport{JarkeBubenkoRollandSutcliffeVassiliou92,
  author =    "Matthias Jarke and Janis Bubenko and Colette Rolland and Alistair Sutcliffe and 
           Yannis Vassiliou",
  title =     "Theories {U}nderlying {R}equirements {E}ngineering: {A}n {O}verview of {NATURE} at {G}enesis",
  institution = "RWTH Aachen",
  year =      "1992",
  number =    "AIB-36-1992",
  url =       "http://aib.informatik.rwth-aachen.de/1992/1992-36.ps.gz",
}